貴族のお坊ちゃんだけど、世界平和のために勇者のヒロインを奪います (Associated Names)

A man who was playing a game in Japan, dies of cardiac arrest. In the brink of death, he was requested a favor by the Goddess of the eroge he was playing. “After defeating The Great Demonic Lord, please save the world from the tyranny of the Hero.” With his knowledge of the current era…